AS31 — CIT

AS31 announces 7 IPv4 prefixes covering 131,844 addresses and 3 IPv6 prefixes.

About this network

An early low-numbered allocation (CIT) serving the California Institute of Technology (Caltech) in Pasadena, California.

What it's used for

• Campus, research, and administrative networking for Caltech and its labs.

Notable

• Institutional address space, not commercial hosting or transit.
• The two-digit AS number reflects how early Caltech joined the internet, when numbers were handed out roughly in sequence.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 131.215.0.0/16
• 134.4.0.0/16
• 137.164.3.74/31
• 137.164.3.204/31
• 192.12.19.0/24
• 192.31.43.0/24
• 192.41.208.0/24
• 2607:f380:1::118:9a40:34a0/123
• 2607:f380:1::118:9a40:3cc0/123
• 2607:f520::/32

Upstream networks

• AS13335 Cloudflare, Inc.
• AS2152 CENIC
• AS2153 CENIC

Adjacent networks

• AS13335 Cloudflare, Inc.
• AS2152 CENIC
• AS2153 CENIC